Malicious PDF — malware analysis report

Static analysis result for SHA-256 677fa0860c748cff…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 04:33:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ec90988fb48e742f35c3227d04cb1585 SHA-1: a9dda480811b5b558b3085c736c114e3a17d74d6 SHA-256: 677fa0860c748cffd25a9c95e5a485da58aeb3a643cc469a53cdc21f333ef2fa
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a lure for 'free Robux' or game hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the heuristics confirm it links to a redirector. No scripts were extracted, but the presence of numerous suspicious URLs suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/free-robux-obbies-that-work-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-radio-gamepass-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/pubg-uc-zain_GM1330123889.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-admin-hack-no-script_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-character-girl-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/actual-working-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-booga-booga-hacks-no-script-needed_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacks-para-roblox-descargar-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000300b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300B 21944 bytes
SHA-256: 620315505948b51d642ee08ca2aa489b5cfe1dd5aa132889e72e210e71b62e6c
font_01_sfnt_off0000609f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609F 19472 bytes
SHA-256: edce560c47cfe081964b731344c7182355c76add9d92cc20aa6e8fdb795b126a

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